Abstract This paper investigates the temperature profile of large scale RP – 5 aviation kerosene pool fire in an open space through a series of large scale experiments of 1 m2, 5 m2, 10 m2, 25 m2 pool sizes. The temperature profile is acquired by thermocouple trees positioned in various distances to the pool centerline, while the ambient wind velocity is captured by four transducers in the experimental field. Results show that the large scale pool fire behaves different to the used small to medium scale experiments. The mass loss rate is in good agreement with Blinov and Khudyakov’s results, but the vertical temperature is much lower than the McCaffery’s results due to the reduced global combustion efficiency as more sooty smoke produced. The three regimes in McCaffery’s model is redefined, correlating well with the vertical temperature profile upon the pool centerline. Gaussian Fit is well proposed for the lateral temperature profile at the pool base level, however as the ambient wind inevitable, the fire plume would be tilted to the downstream direction. Finally, the isothermal diagrams of fire plume for various pool sizes are plotted showing the temperature field of plumes, and also the tilt angle of plumes is presented.